CN217623107U

CN217623107U - Multi-gear driving system of hybrid power vehicle

Info

Publication number: CN217623107U
Application number: CN202221359410.1U
Authority: CN
Inventors: 李晓宇; 柴召朋; 杨林; 赵彦辉; 王墨; 赵春雁; 孙楚萍; 范永琦; 甄帅; 周宏�; 冯咏军; 武文生; 韩学勇; 石伟; 于泳轩
Original assignee: Harbin Dongan Automotive Engine Manufacturing Co Ltd
Current assignee: Harbin Dongan Automotive Engine Manufacturing Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-10-21
Anticipated expiration: 2032-05-31

Abstract

A multi-gear driving system of a hybrid vehicle relates to the technical field of the driving system of the hybrid vehicle. The crankshaft of the engine is connected with the outer hubs of the two clutches, the inner hub of the first clutch is connected with the third sun gear, the inner hub of the second clutch is connected with the first planet carrier, the first planet carrier is connected with the inner hub of the first brake, the rotor shaft of the second motor is connected with the second sun gear and the inner hub of the second brake, the first planet carrier is respectively connected with the short planet gear and the long planet gear, the third sun gear is meshed with the short planet gear, both the short planet gear and the second sun gear are meshed with the long planet gear, the long planet gear is meshed with the first outer gear ring, and the first outer gear ring is connected with the second planet carrier; a rotor shaft of the first motor is fixedly connected with the first sun gear, the second outer gear ring is meshed with a planet gear of the transmission mechanism, and the second planet carrier is respectively connected with the planet gear of the transmission mechanism and an output shaft of the transmission. The utility model discloses a driving system possesses multiple mode to have low cost, lightweight, compact structure's characteristics.

Description

Multi-gear driving system of hybrid power vehicle

Technical Field

The utility model relates to a hybrid vehicle actuating system technical field, concretely relates to multi-gear actuating system of hybrid vehicle.

Background

The research and development of the driving device of the hybrid vehicle integrates various new technologies, including key technologies such as hybrid configuration analysis, parameter matching, energy-saving analysis, battery technology and motor electric control technology, and basically covers the general key technologies in the research and development process of most new energy vehicles. The hybrid power system can enable the engine to operate in a high-efficiency area mainly through the coordinated work of the motor, so that the efficiency of the whole system is improved, and the hybrid power system is low in cost, light in weight and compact in structure.

In the design scheme of the power assembly of a plurality of hybrid vehicles, the engine and the motor of the parallel hybrid power device drive the vehicle in a mechanical energy superposition mode, the engine and the motor can independently provide power for a vehicle transmission system, and can be driven together or independently when different roads or vehicles are required. And thus is widely used. However, the above design has the disadvantages that the pure electric starting capability is not available, the number of gears limits the use of the engine in a high-efficiency area, and the gear shifting process is relatively complex.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a many gears actuating system of hybrid vehicle for solving the problem that exists among the background art.

The utility model discloses a hybrid vehicle multi-gear driving system possesses pure electric mode, parallel mode and series-parallel mode; according to the working condition requirements of the vehicle, different working modes are selected to meet the requirements of the vehicle, and meanwhile, the multi-gear driving system and the engine of the hybrid vehicle are in an efficient working area. The pure electric mode of the system provides a mode that when the engine does not provide power, the electric energy is provided by the battery to drive the motor to work independently, and the normal running of the vehicle is realized through the transmission mechanism of the transmission. The pure electric mode is divided into two power driving modes according to the working condition of the motor, wherein one power driving mode is a single-motor working mode, and the other power driving mode is a double-motor working mode. In the parallel mode, the engine can work independently, the power distribution mechanism and the transmission mechanism of the speed changer can normally transmit power to drive the whole vehicle to run, and meanwhile, the motor can be used for adjusting the torque of the engine to improve the efficiency of the engine. The hybrid mode (also called as a hybrid power splitting mode) is used for driving the vehicle to normally run by applying the simultaneous work of an engine and a motor; by controlling the work of the motor, the rotating speed and the torque working point of the engine can be adjusted, and the oil consumption of the engine is reduced. In the running process of the vehicle, the fuel consumption of the vehicle can be effectively saved by switching the working modes.

Realize above-mentioned purpose, the utility model discloses the technical scheme who takes as follows:

a multi-gear driving system of a hybrid vehicle comprises an engine, a power distribution mechanism, a transmission mechanism, two motors, two clutches and two brakes; the two motors are respectively a first motor and a second motor, the two clutches are respectively a first clutch and a second clutch, the two brakes are respectively a first brake and a second brake, the power distribution mechanism comprises a second sun gear, a third sun gear, a first planet carrier, a short planet gear, a long planet gear and a first outer gear ring, and the transmission mechanism comprises a first sun gear, a second planet carrier, a planet gear of the transmission mechanism and a second outer gear ring;

the crankshaft of the engine is connected with a first clutch and an outer hub of a second clutch, the inner hub of the first clutch is connected with a third sun gear, the inner hub of the second clutch is connected with a first planet carrier, the first planet carrier is connected with the inner hub of a first brake, a rotor shaft of a second motor is connected with the second sun gear and the inner hub of the second brake, the outer hubs of the first brake and the second brake are integrated with the inner wall of a transmission shell, the first planet carrier is respectively connected with a short planet gear and a long planet gear, the third sun gear is meshed with the short planet gear, the short planet gear and the second sun gear are both meshed with the long planet gear, the long planet gear is meshed with a first outer gear ring, and the first outer gear ring is connected with the second planet carrier;

a rotor shaft of the motor I is fixedly connected with the sun gear I, an outer gear ring II is meshed with a planet gear of the transmission mechanism, the outer gear ring II is fixedly connected with the inner wall of the transmission shell, and a planet carrier II is respectively connected with the planet gear of the transmission mechanism and an output shaft of the transmission; the stators of the first motor and the second motor are respectively arranged in the shell of the speed changer.

Further, the multi-gear driving system of the hybrid vehicle also comprises a torsional damper or a dual-mass flywheel; a torsional damper or dual mass flywheel is connected between the outer hubs of the first and second clutches and the crankshaft of the engine.

Further, the first clutch and the second clutch share one outer hub, or the first clutch and the second clutch respectively have respective outer hubs, and the two outer hubs are connected through a spline or a welding mode.

Further, the multi-gear driving system of the hybrid vehicle can realize the following working modes:

a first gear of a pure electric mode; the two clutches and the two brakes are disconnected, the engine and the motor II do not work, and the motor I works;

pure electric mode second gear; the second brake and the two clutches are disconnected, the first brake is combined, the engine does not work, and the two motors work;

parallel mode first gear; the second clutch and the second brake are disconnected, the first clutch and the first brake are combined, and the engine and the two motors work;

a parallel mode second gear; the second clutch and the first brake are disconnected, the first clutch and the second brake are combined, the second motor does not work, and the engine and the first motor both work;

parallel mode third gear; the two brakes are disconnected, the two clutches are combined, and the engine and the two motors work;

a parallel mode fourth gear; the first clutch and the first brake are disconnected, the second clutch and the second brake are combined, the second motor does not work, and the engine and the first motor both work;

a series-parallel mode first gear; the second clutch and the two brakes are disconnected, the first clutch is combined, and the engine and the two motors work;

a series-parallel mode second gear; the first clutch and the two brakes are disconnected, the second clutch is combined, and the engine and the two motors work;

a parking/parking power generation mode; the first clutch and the two brakes are disconnected, the second clutch is combined, the first motor does not work, and the engine and the second motor both work.

Further, the power transmission path of the first gear of the pure electric mode is as follows:

the power of the vehicle is provided by the operation of the first motor, the first motor is fixedly connected with the first sun gear, the second outer gear ring is fixedly connected with the inner wall of the shell of the transmission, and the first sun gear is meshed with the planet gear of the transmission mechanism to transmit power; the power of the first motor is transmitted to the output shaft of the speed changer through the first sun gear, the planet gear of the speed changer transmission mechanism and the second planet carrier in sequence to carry out power output;

the power transmission path of the pure electric mode second gear is as follows:

the brake I is combined, the power of the vehicle is provided by the joint work of the motor I and the motor II, the brake I is connected with the planet carrier I, the motor II operates to provide reverse rotating speed and torque, the provided power is transmitted to the long planet gear through the sun gear II, and the long planet gear transmits the power to the output shaft of the transmission through the outer gear ring I and the planet carrier II in sequence;

the first motor is fixedly connected with the first sun gear, the second outer gear ring is fixedly connected with the shell of the transmission, and the first sun gear is meshed with the planet gear of the transmission mechanism to transmit power; the power of the motor I is transmitted to the output shaft of the transmission through the sun gear I, the planet gear of the transmission mechanism and the planet carrier II in sequence; and the power of the first external gear ring and the second planet carrier is connected in parallel at the output shaft of the transmission for power transmission.

Further, the power transmission path of the parallel mode first gear is as follows:

the first clutch and the first brake are combined, and the power of the engine is transmitted to the long planet wheel through the first clutch, the third sun wheel and the short planet wheel in sequence; the power of the motor II is transmitted to the long planet wheel through the sun wheel II; the power of the engine and the power of the motor II are connected in parallel at the long planet wheel and then transmitted to the outer gear ring I, and the outer gear ring transmits the power to the output shaft of the transmission through the planet carrier II;

the power of the first motor is transmitted to the output shaft of the speed changer through the first sun gear, the planet gear of the speed changer transmission mechanism and the second planet carrier in sequence; the power of the first external gear ring and the second planet carrier is connected in parallel at the output shaft of the transmission to transmit power;

the power transmission path of the parallel mode second gear is as follows:

the first clutch and the second brake are combined, and the rotor of the second motor and the second sun gear are locked; the power of the engine is transmitted to the first outer gear ring through the first clutch, the third sun gear, the short planet gear and the long planet gear in sequence, and the outer gear ring transmits the power to the output shaft of the transmission through the second planet carrier;

the power of the motor I is transmitted to the output shaft of the transmission through the sun gear I, the planet gear of the transmission mechanism and the planet carrier II in sequence; the power of the first external gear ring and the second planet carrier is connected in parallel at the output shaft of the transmission to transmit power;

the power transmission path of the parallel mode third gear is as follows:

the first clutch and the second clutch are combined, and the power of the engine is transmitted to the first clutch and the second clutch; the first clutch transmits power to the long planet gear through the third sun gear and the short planet gear in sequence; the second clutch transmits power to the long planetary gear through the planetary carrier; the power of the motor II is transmitted to the long planet wheel through the sun wheel II; the power of the first clutch, the second clutch and the second motor is transmitted to the first outer gear ring after being connected in parallel at the long planet wheel, and the first outer gear ring transmits the power to the output shaft of the transmission through the second planet carrier;

the power transmission path of the parallel mode fourth gear is as follows:

the second clutch is combined with the second brake, and a rotor of the second motor and the second sun gear are locked; the power of the engine is transmitted to the first outer gear ring through the second clutch, the first planet carrier and the long planet gear in sequence, and the outer gear ring transmits the power to the output shaft of the transmission through the second planet carrier;

the power of the motor I is transmitted to the output shaft of the transmission through the sun gear I, the planet gear of the transmission mechanism and the planet carrier II in sequence; and the power of the first external gear ring and the second planet carrier is connected in parallel at the output shaft of the transmission for power transmission.

Further, the power transmission path of the series-parallel mode first gear is as follows;

the first clutch is combined, and the engine and the two motors work; regarding the rotational speed: the rotating speeds of the engine and the motor II are controlled, the power of the engine is transmitted to the long planet wheel through the clutch I, the sun gear III and the short planet wheel in sequence, and the power of the motor II is transmitted to the long planet wheel through the sun gear II; the power of the engine and the power of the motor II are connected in parallel at the long planet wheel and then transmitted to the outer gear ring I, so that the rotating speed of the outer gear ring I can be known; the outer gear ring I transmits power to the planet carrier II, the planet gear of the transmission mechanism and the sun gear I in sequence, and the sun gear transmits power to the motor I again and again, so that the rotating speed of the motor I can be known;

or the rotating speeds of the engine and the first motor are controlled, and the power of the first motor is transmitted to the long planet wheel through the first sun wheel, the planet wheel of the transmission mechanism, the second planet carrier and the outer gear ring in sequence; the power of the engine is transmitted to the long planet wheel through the clutch I, the sun wheel III and the short planet wheel in sequence; the power of the engine and the power of the first motor are connected in parallel at the long planet wheel and then are transmitted to the second motor through the second sun wheel, so that the rotating speed of the second motor can be known;

with respect to the torque: the torque of the engine is transmitted to the long planet wheel through the clutch I, the sun wheel III and the short planet wheel in sequence; one part of torque is transmitted to a sun gear II and a motor II through a long planet gear; the other part of torque is transmitted to the first outer gear ring through the long planet wheel; the outer gear ring transfers the torque to the output shaft of the speed changer through the planet carrier II; the torque of the motor I is transmitted to a transmission output shaft through a sun gear I, a transmission mechanism planet gear and a planet carrier II in sequence; the torque of the first external gear ring and the torque of the second planet carrier are connected in parallel at the output shaft of the transmission to transmit power;

the power transmission path of the second gear of the series-parallel mode is as follows;

the second clutch is combined, and the engine and the two motors work; with respect to the rotational speed: the rotating speeds of the engine and the motor II are controlled, and the power of the engine is transmitted to the long planet wheel through the clutch II and the planet carrier I in sequence; the power of the motor II is transmitted to the long planet wheel through the sun wheel II; the power of the engine and the power of the motor II are connected in parallel at the long planet wheel and then transmitted to the outer gear ring I, so that the rotating speed of the outer gear ring I can be known; the outer gear ring I transmits power to the planet carrier II, the transmission mechanism planet gear and the sun gear I in sequence, the sun gear transmits power to the motor I again, and the rotating speed of the motor I can be known;

or the rotating speeds of the engine and the motor I are controlled, and the power of the engine is transmitted to the long planet wheel through the clutch II and the planet carrier in sequence; the power of the motor I is transmitted to the long planet gear through the sun gear I, the planet gear of the transmission mechanism, the planet carrier II and the outer gear ring in sequence; the power of the engine and the power of the first motor are connected in parallel at the long planet wheel and then are transmitted to the second motor through the second sun wheel, so that the rotating speed of the second motor can be known;

with respect to the torque: the torque of the engine is transmitted to the long planet gear through the clutch II and the planet carrier I in sequence, and a part of the torque is transmitted to the sun gear II and the motor II through the long planet gear; the other part of torque is transmitted to the first outer gear ring through the long planet wheel; the outer gear ring transmits the torque to the output shaft of the transmission through the second planet carrier;

the torque of the motor I is transmitted to a transmission output shaft through a sun gear I, a transmission mechanism planet gear and a planet carrier II in sequence; and the torque of the first external gear ring and the torque of the second planet carrier are connected in parallel at the output shaft of the transmission for power transmission.

Further, the power transmission path in the parking/parking power generation mode is as follows;

when the vehicle is parked/stopped, the engine is started through the second motor, after the engine is started successfully, power of the engine is transmitted to the long planet wheel and the short planet wheel through the second clutch and the first planet carrier, the long planet wheel transmits the power to the second sun wheel, and the power is transmitted to the second motor through the second sun wheel to rotate and generate power to convert mechanical energy into electric energy and realize a battery charging function.

Compared with the prior art, the beneficial effects of the utility model are that:

1. simple structure, reasonable in design, cost are lower relatively, and based on the planet row integrated configuration and the part of the mature product in market, through increasing two motors, two clutches and two stopper, realized possessing respectively single, the pure electric mode of bi-motor, the parallel mode and the series-parallel connection power reposition of redundant personnel mode of four fixed gears.

2. The parallel-series power splitting mode can effectively improve the working condition of the engine, and the fuel economy and the dynamic property of the vehicle within the full working condition range can be effectively solved by combining four fixed gears in parallel connection, so that the engine can be always in a high-efficiency area, and the excellent fuel consumption performance of the whole vehicle can be achieved.

3. In the switching process of each mode, the motor participates in driving, and power interruption does not exist.

4. The utility model discloses a actuating system can cover HEV and thoughtlessly move and PHEV inserts electric formula hybrid vehicle model, and the platformization is good.

5. The relative cost of the motor is increased, but the oil consumption is reduced from the angle of the whole automobile, the aim of the new energy automobile is achieved, and the aims of energy conservation and emission reduction are fulfilled. Just the utility model discloses a driving system has advantages such as structural design is reasonable, the assembly is simple, low cost.

6. The utility model discloses a many gears actuating system of hybrid vehicle possesses multiple mode, two gear modes of electricelectric promptly, four gear modes of parallelly connected, two gear modes of series-parallel connection, parking/electricity generation mode etc.. According to the vehicle demand, select different mode for use, can realize pure electric motor, two motor drive, especially two motor drive modes, reduce driving motor performance requirement and cost, can provide more excellent dynamic nature again to the vehicle. The use of a multi-gear parallel and series-parallel hybrid working mode can enable the engine to be in a high-efficiency area under the condition of the full working condition of the vehicle; therefore, the efficiency of the whole system is improved, and the system has the characteristics of low cost, light weight and compact structure.

Drawings

Fig. 1 is a schematic structural diagram of a multi-gear driving system of a hybrid vehicle according to the present invention.

The names and reference numbers of the components related to the above figures are as follows:

the hybrid power transmission device comprises an engine 1, a torsional damper 2, a motor II 3, a motor I4, a clutch I5, a clutch II 6, a brake I7, a brake II 8, a sun gear II 9, a sun gear III 10, a planet carrier I11, an outer gear ring I12, a short planet gear 13, a long planet gear 14, a sun gear I15, a planet carrier II 16, an outer gear ring II 17, a transmission mechanism planet gear 18, a transmission output shaft 19, a power distribution mechanism, a transmission mechanism and a transmission shell 24.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

The first embodiment is as follows: as shown in fig. 1, the present embodiment discloses a multi-gear drive system of a hybrid vehicle, which includes an engine 1, a power distribution mechanism, a transmission mechanism, two motors, two clutches, and two brakes; the two motors are respectively a first motor 4 and a second motor 3, the two clutches are respectively a first clutch 5 and a second clutch 6, the two brakes are respectively a first brake 7 and a second brake 8, the power distribution mechanism comprises a second sun gear 9, a third sun gear 10, a first planet carrier 11, a short planet gear 13, a long planet gear 14 and a first outer gear ring 12 (teeth are arranged on the inner ring surface of the first outer gear ring 12), and the transmission mechanism comprises a first sun gear 15, a second planet carrier 16, a transmission mechanism planet gear 18 and a second outer gear ring 17 (teeth are arranged on the inner ring surface of the second outer gear ring 17);

the crankshaft of the engine 1 is connected with the outer hubs of the first clutch 5 and the second clutch 6, the inner hub of the first clutch 5 is connected with the third sun gear 10, the inner hub of the second clutch 6 is connected with the first planet carrier 11, the first planet carrier 11 is connected with the inner hub of the first brake 7, the rotor shaft of the second motor 3 is connected with the second sun gear 9 and the inner hub of the second brake 8, the outer hubs of the first brake 7 and the second brake 8 are integrally formed with the inner wall of the transmission shell 24, the first planet carrier 11 is respectively connected with the short planet gears 13 and the long planet gears 14, the third sun gear 10 is meshed with the short planet gears 13, the short planet gears 13 and the second sun gear 9 are meshed with the long planet gears 14, the long planet gears 14 are meshed with the first outer gear ring 12, and the first outer gear ring 12 is connected with the second planet carrier 16;

a rotor shaft of the motor I4 is fixedly connected with a sun gear I15, an outer gear ring II 17 is meshed with a planetary gear 18 of a transmission mechanism, the outer gear ring II 17 is fixedly connected with the inner wall of a transmission shell 24 (preferably, outer teeth fixedly connected with the inner wall of the transmission shell 24 are arranged on the outer ring surface of the outer gear ring II 17), and a planetary carrier II 16 is respectively connected with the planetary gear 18 of the transmission mechanism and a transmission output shaft 19 (the transmission output shaft 19 can be connected with a rear-end speed reducing mechanism or a transmission mechanism of a rear axle of a vehicle to transmit power to the wheel of the vehicle); the stators of the first motor 4 and the second motor 3 are respectively arranged in the transmission shell 24.

The second embodiment is as follows: as shown in fig. 1, the present embodiment is further described with respect to the first embodiment, and the hybrid vehicle multi-gear driving system further includes a torsional damper 2 or a dual mass flywheel; a torsional damper 2 or dual mass flywheel is connected between the outer hubs of the first and second clutches 5 and 6 and the crankshaft of the engine 1.

The third concrete implementation mode: as shown in fig. 1, the first embodiment is further described, in which the first clutch 5 and the second clutch 6 share one outer hub, or the first clutch 5 and the second clutch 6 have respective outer hubs, and the two outer hubs are connected by a spline or by welding.

The fourth concrete implementation mode: as shown in fig. 1, the present embodiment is further described with respect to any one of the first to third embodiments, and the hybrid vehicle multi-gear drive system can realize the following operating modes: as shown in fig. 1;

TABLE 1

A first gear of a pure electric mode; the two clutches and the two brakes are disconnected, the engine 1 and the motor II 3 do not work, and the motor I4 works;

pure electric mode second gear; the second brake 8 and the two clutches are disconnected, the first brake 7 is combined, the engine 1 does not work, and the two motors work;

parallel mode first gear; the second clutch 6 and the second brake 8 are disconnected, the first clutch 5 and the first brake 7 are combined, and the engine 1 and the two motors work;

a parallel mode second gear; the second clutch 6 and the first brake 7 are disconnected, the first clutch 5 and the second brake 8 are combined, the second motor 3 does not work, and the engine 1 and the first motor 4 both work;

parallel mode third gear; the two brakes are disconnected, the two clutches are combined, and the engine 1 and the two motors work;

a parallel mode fourth gear; the first clutch 5 and the first brake 7 are disconnected, the second clutch 6 and the second brake 8 are combined, the second motor 3 does not work, and the engine 1 and the first motor 4 both work;

a series-parallel mode first gear; the second clutch 6 and the two brakes are disconnected, the first clutch 5 is combined, and the engine 1 and the two motors work;

a series-parallel mode second gear; the first clutch 5 and the two brakes are disconnected, the second clutch 6 is combined, and the engine 1 and the two motors work;

a parking/parking power generation mode; the first clutch 5 and the two brakes are disconnected, the second clutch 6 is combined, the first motor 4 does not work, and the engine 1 and the second motor 3 both work.

The fifth concrete implementation mode: as shown in fig. 1, the fourth embodiment is further explained, and the power transmission path of the first pure electric mode (two clutches and two brakes are disconnected, the engine 1 and the motor two 3 are not operated, and only the motor one 4 is operated) is as follows:

the power of the vehicle is provided by the work of the motor I4, the motor I4 is fixedly connected with the sun gear I15, the outer gear ring II 17 is fixedly connected with the inner wall of the transmission shell 24, and the sun gear I15 is meshed with the planet gear 18 of the transmission mechanism to carry out power transmission; the power of the motor I4 is transmitted to a transmission output shaft 19 through a sun gear I15, a transmission mechanism planet gear 18 and a planet carrier II 16 in sequence to be output;

in the pure electric mode, the first motor 4 is subjected to primary speed reduction and can be connected with a rear end speed reducing mechanism or a rear axle speed changer mechanism of a wheel, and then power reaches the wheel of the vehicle. According to the speed and the torque demand of the vehicle, the working point of the first motor 4 is adjusted to meet the vehicle demand, and the power performance of the vehicle can be improved. Because the first motor 4 has the operating characteristics of forward rotation and reverse rotation, the forward gear and reverse gear functions of the vehicle can be realized according to the vehicle requirement condition.

The power transmission path of the pure electric mode second gear (the second brake 8 and the two clutches are disconnected, the first brake 7 is connected, the engine 1 does not work, and the two motors work) is as follows:

the brake I7 is combined, the power of the vehicle is provided by the joint work of the motor I4 and the motor II 3, the brake I7 is connected with the planet carrier I11, the motor II 3 operates to provide reverse rotating speed and torque according to the operating characteristics of the planet row, the provided power is transmitted to the long planet gears 14 through the sun gear II 9, and the long planet gears 14 transmit the power to the transmission output shaft 19 through the outer gear ring I12 and the planet carrier II 16 in sequence;

the first motor 4 is fixedly connected with the first sun gear 15, the second outer gear ring 17 is fixedly connected with the transmission shell 24, and the first sun gear 15 is meshed with the planet gear 18 of the transmission mechanism to carry out power transmission; the power of the motor I4 is transmitted to a transmission output shaft 19 through a sun gear I15, a transmission mechanism planet gear 18 and a planet carrier II 16 in sequence; the power of the first external gear ring 12 and the second planetary carrier 16 is transmitted in parallel at the output shaft 19 of the transmission.

The difference between the pure electric mode first gear and the pure electric mode second gear is as follows: the pure electric mode first gear can only provide one motor one 4 to drive the vehicle to travel, and the pure electric mode second gear provides two motors (namely the motor one 4 and the motor two 3) to drive the vehicle to travel together, promotes the dynamic property and the acceleration nature of vehicle. When the pure electric mode is in the second gear, the first clutch 5 and the second clutch 6 do not work and are in a disconnected state, so that the engine 1 cannot be dragged and rotated passively, and the energy loss of the dragged and operated engine 1 can be avoided.

The sixth specific implementation mode: as shown in fig. 1, the present embodiment is further explained for the fourth embodiment, and the power transmission path of the parallel mode first gear (the second clutch 6 and the second brake 8 are both off, the first clutch 5 and the first brake 7 are both on, and the engine 1 and the two motors are both on) is as follows:

the first clutch 5 and the first brake 7 are combined, the power of the vehicle is mainly provided by the work of the engine 1, and the power of the engine 1 is transmitted to the long planet wheel 14 through the first clutch 5, the third sun wheel 10 and the short planet wheel 13 in sequence; the power of the second motor 3 is transmitted to the long planetary wheel 14 through the second sun wheel 9; the power of the engine 1 and the power of the motor II 3 are connected in parallel at the long planetary wheel 14 and then transmitted to the outer gear ring I12, and the outer gear ring I12 transmits the power to the transmission output shaft 19 through the planet carrier II 16;

the power of the first motor 4 is transmitted to a transmission output shaft 19 through a first sun gear 15, a transmission mechanism planet gear 18 and a second planet carrier 16 in sequence; the power of the first external gear ring 12 and the second planet carrier 16 is connected in parallel at the output shaft 19 of the transmission for power transmission;

the power transmission path of the second parallel mode (the second clutch 6 and the first brake 7 are disconnected, the first clutch 5 and the second brake 8 are connected, the second motor 3 does not work, and the engine 1 and the first motor 4 work) is as follows:

the first clutch 5 and the second brake 8 are combined, and the rotor of the second motor 3 and the second sun gear 9 are locked (cannot rotate); the power of the engine 1 is transmitted to the first outer gear ring 12 through the first clutch 5, the third sun gear 10, the short planet gear 13 and the long planet gear 14 in sequence, and the first outer gear ring 12 transmits the power to the output shaft 19 of the transmission through the second planet carrier 16;

the power of the motor I4 is transmitted to a transmission output shaft 19 through a sun gear I15, a transmission mechanism planet gear 18 and a planet carrier II 16 in sequence; the power of the first external gear ring 12 and the second planet carrier 16 is connected in parallel at the output shaft 19 of the transmission for power transmission;

the power transmission path for the parallel mode third gear (both brakes off, both clutches on, both engines 1 and both motors on) is as follows:

the first clutch 5 and the second clutch 6 are combined, and the power of the engine 1 is transmitted to the first clutch 5 and the second clutch 6; the first clutch 5 transmits power to the long planet wheel 14 through the third sun wheel 10 and the short planet wheel 13 in sequence; the second clutch 6 transmits power to the long planet wheel 14 through the first planet carrier 11; the power of the second motor 3 is transmitted to the long planet wheel 14 through the second sun wheel 9; the power of the first clutch 5, the second clutch 6 and the second motor 3 is transmitted to the first outer gear ring 12 after being connected in parallel at the long planet wheel 14, and the first outer gear ring 12 transmits the power to the output shaft 19 of the transmission through the second planet carrier 16;

the power transmission path of the parallel mode fourth gear (the first clutch 5 and the first brake 7 are disconnected, the second clutch 6 and the second brake 8 are connected, the second motor 3 is not operated, and the engine 1 and the first motor 4 are operated) is as follows:

the second clutch 6 and the second brake 8 are combined, and the rotor of the second motor 3 and the second sun gear 9 are locked (cannot rotate); the power of the engine 1 is transmitted to the first outer gear ring 12 through the second clutch 6, the first planet carrier 11 and the long planet gears 14 in sequence, and the first outer gear ring 12 transmits the power to the output shaft 19 of the transmission through the second planet carrier 16;

the power of the motor I4 is transmitted to a transmission output shaft 19 through a sun gear I15, a transmission mechanism planet gear 18 and a planet carrier II 16 in sequence; the power of the first external gear ring 12 and the second planetary carrier 16 is transmitted in parallel at the output shaft 19 of the transmission.

The difference between the parallel mode first, second, third and fourth gears is that: the power transmission path of the engine 1 is different, and the speed ratio of the engine 1 to the first outer ring gear 12 and the transmission output shaft 19 is different. Corresponding speed ratio can be selected to meet vehicle requirements, the working condition of the engine 1 is adjusted, and the engine 1 is in a better fuel consumption area.

The seventh concrete implementation mode: as shown in fig. 1, the present embodiment is further explained for the fourth embodiment, and the power transmission path of the series-parallel mode first gear (the second clutch 6 and both brakes are off, the first clutch 5 is on, and both the engine 1 and both the motors are on) is as follows;

the first clutch 5 is combined, and the engine 1 and the two motors work; regarding the rotational speed: according to the running characteristics of the planet row, the rotating speeds of the engine 1 and the motor II 3 are controlled, the power of the engine 1 is transmitted to the long planet wheel 14 through the clutch I5, the sun wheel III 10 and the short planet wheel 13 in sequence, and the power of the motor II 3 is transmitted to the long planet wheel 14 through the sun wheel II 9; the power of the engine 1 and the power of the motor II 3 are transmitted to the outer gear ring I12 after being connected in parallel at the long planet wheel 14, and the rotating speed of the outer gear ring I12 can be known; the first external gear ring 12 transmits power to the second planet carrier 16, the planet gear 18 of the transmission mechanism and the first sun gear 15 in sequence, the first sun gear 15 transmits the power to the first motor 4, and the rotating speed of the first motor 4 can be known;

or the rotating speeds of the engine 1 and the motor I4 are controlled, and the power of the motor I4 is transmitted to the long planet wheel 14 through the sun wheel I15, the planet wheel 18 of the transmission mechanism, the planet carrier II 16 and the outer gear ring I12 in sequence; the power of the engine 1 is transmitted to the long planet wheel 14 through the clutch I5, the sun wheel III 10 and the short planet wheel 13 in sequence; the power of the engine 1 and the power of the first motor 4 are connected in parallel at the long planetary wheel 14 and then are transmitted to the second motor 3 through the second sun wheel 9, so that the rotating speed of the second motor 3 can be known;

with respect to the torque: according to the characteristics of the planet row, the torque of the engine 1 is transmitted to the long planet wheel 14 through the clutch I5, the sun wheel III 10 and the short planet wheel 13 in sequence; a part of torque is transmitted to the second sun gear 9 and the second motor 3 through the long planet gear 14; the other part of the torque is transmitted to the first external gear ring 12 through the long planet wheel 14; the first external gear ring 12 transmits the torque to a transmission output shaft 19 through a second planet carrier 16; the torque of the first motor 4 is transmitted to a transmission output shaft 19 through a first sun gear 15, a transmission mechanism planet gear 18 and a second planet carrier 16 in sequence; the torques of the first external gear ring 12 and the second planet carrier 16 are connected in parallel at the output shaft 19 of the transmission for power transmission;

this power split mode is also referred to as ECVT mode because the rotational speed of the engine 1 is influenced by the rotational speeds of the first motor 4 or the second motor 3, and the relative continuity relationship between the engine 1 and the vehicle speed.

The power transmission path of the second gear of the series-parallel mode (the first clutch 5 and the two brakes are disconnected, the second clutch 6 is combined, and the engine 1 and the two motors work) is as follows;

the second clutch 6 is combined, and the engine 1 and the two motors work; regarding the rotational speed: according to the running characteristic of the planet row, the rotating speeds of the engine 1 and the motor II 3 are controlled, and the power of the engine 1 is transmitted to the long planet wheel 14 through the clutch II 6 and the planet carrier I11 in sequence; the power of the second motor 3 is transmitted to the long planet wheel 14 through the second sun wheel 9; the power of the engine 1 and the power of the motor II 3 are connected in parallel at the long planetary gear 14 and then transmitted to the outer gear ring I12, so that the rotating speed of the outer gear ring I12 can be known; the first external gear ring 12 transmits power to the second planet carrier 16, the planet gear 18 of the transmission mechanism and the first sun gear 15 in sequence, the first sun gear 15 transmits the power to the first motor 4, and the rotating speed of the first motor 4 can be known;

or the rotating speeds of the engine 1 and the motor I4 are controlled, and the power of the engine 1 is transmitted to the long planet wheel 14 through the clutch II 6 and the planet carrier I11 in sequence; the power of the motor I4 is transmitted to the long planet wheel 14 through the sun wheel I15, the planet wheel 18 of the transmission mechanism, the planet carrier II 16 and the outer gear ring I12 in sequence; the power of the engine 1 and the power of the motor I4 are connected in parallel at the long planet wheel 14 and then are transmitted to the motor II 3 through the sun wheel II 9, so that the rotating speed of the motor II 3 can be known;

with respect to the torque: according to the characteristics of the planet row, the torque of the engine 1 is transmitted to the long planet gears 14 through the clutch II 6 and the planet carrier I11 in sequence, and a part of the torque is transmitted to the sun gear II 9 and the motor II 3 through the long planet gears 14; the other part of the torque is transmitted to the first external gear ring 12 through the long planet wheel 14; the first external gear ring 12 transmits the torque to a transmission output shaft 19 through a second planet carrier 16;

the torque of the motor I4 is transmitted to a transmission output shaft 19 through a sun gear I15, a transmission mechanism planet gear 18 and a planet carrier II 16 in sequence; the torques of the first external gear ring 12 and the second planet carrier 16 are connected in parallel at the output shaft 19 of the transmission for power transmission;

the utility model discloses in, to the series-parallel mode power split mode that is, the rotational speed of vehicle demand and engine 1, moment of torsion regulation control strategy brief: in general, the first motor 4 is used as a driving motor, and the second motor 3 is used as a generating motor; the required speed and the required torque of the vehicle are used as input quantities, the rotating speed of a first motor 4 can be calculated for the rotating speed of each power source (comprising the engine 1 and two motors), the rotating speed of the engine 1 is preset according to a high-efficiency area, and the rotating speed of a second motor 3 can be calculated. The torque of each power source is formed by the torque generated by the motor I4 and the torque generated by the engine 1, the engine 1 transmits the external gear ring I12 and the output shaft 19 of the transmission, namely the vehicle side, through the planet row according to the preset torque of the high-efficiency region, the motor II 3 generates electricity and then provides electric energy for the motor I4 through the DC/DC converter, and the power decoupling device is characterized in that the rotating speed and the torque of the engine 1 can be in power decoupling with the wheel end.

The specific implementation mode eight: as shown in fig. 1, the present embodiment further describes the fourth embodiment, the power transmission path of the parking/parking power generation mode (the first clutch 5 and both brakes are off, the second clutch 6 is on, the first motor 4 is not operated, and both the engine 1 and the second motor 3 are operated) is as follows;

when the vehicle is parked/stopped, the engine 1 is started through the second motor 3, after the engine 1 is started successfully, power of the engine 1 is transmitted to the long planet wheel 14 and the short planet wheel 13 through the second clutch 6 and the first planet carrier 11, the long planet wheel 14 transmits the power to the second sun wheel 9, the second sun wheel 9 is connected with a rotor shaft of the second motor 3, the power is transmitted to the second motor 3 through the second sun wheel 9 to run and generate power, mechanical energy is converted into electric energy, and the electric energy is distributed to enter a battery system (serving as external equipment) through an energy management system (serving as the external equipment), so that a battery charging function is realized. According to the safety strategy, the parking/stopping power generation mode can be selected when the vehicle is in the P gear.

Furthermore, the utility model discloses reverse gear mode in addition: the utility model does not set a mechanical reverse gear mode; under the selectable pure electric mode, the function of controlling the positive and negative rotation of the motor to realize the reverse gear of the vehicle is controlled according to the running characteristic of the motor.

The multi-gear driving system of the hybrid vehicle can realize multiple driving working modes and has the advantages of simple structure, space saving, convenient arrangement, lower cost and the like; the working range of the engine can be optimized through the planetary gear train of the power distribution mechanism, and the economical efficiency of the engine and the oil consumption of the whole vehicle are improved; the pure electric mode, the single and double single machines work in two modes to provide good pure electric driving power performance for the vehicle; under the parallel and series-parallel modes, the engine and the motor can simultaneously participate in driving, the dynamic property is improved, and the working range of the engine is improved.

The above embodiments are merely illustrative of the present patent and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.

Claims

1. A multi-gear drive system of a hybrid vehicle, characterized in that: the hybrid power transmission device comprises an engine (1), a power distribution mechanism, a transmission mechanism, two motors, two clutches and two brakes; the two motors are respectively a motor I (4) and a motor II (3), the two clutches are respectively a clutch I (5) and a clutch II (6), the two brakes are respectively a brake I (7) and a brake II (8), the power distribution mechanism comprises a sun gear II (9), a sun gear III (10), a planet carrier I (11), a short planet gear (13), a long planet gear (14) and an outer gear ring I (12), and the transmission mechanism comprises a sun gear I (15), a planet carrier II (16), a transmission mechanism planet gear (18) and an outer gear ring II (17);

the crankshaft of an engine (1) is connected with outer hubs of a first clutch (5) and a second clutch (6), an inner hub of the first clutch (5) is connected with a third sun gear (10), an inner hub of the second clutch (6) is connected with a first planet carrier (11), the first planet carrier (11) is connected with an inner hub of a first brake (7), a rotor shaft of a second motor (3) is connected with inner hubs of a second sun gear (9) and a second brake (8), outer hubs of the first brake (7) and the second brake (8) are integrally formed with the inner wall of a transmission shell (24), the first planet carrier (11) is respectively connected with a short planet gear (13) and a long planet gear (14), the third sun gear (10) is meshed with the short planet gear (13), the short planet gear (13) and the second sun gear (9) are both meshed with the long planet gear (14), the long planet gear (14) is meshed with a first outer gear ring (12), and the first planet carrier (12) is connected with a second planet carrier (16);

a rotor shaft of the motor I (4) is fixedly connected with the sun gear I (15), an outer gear ring II (17) is meshed with a planetary gear (18) of a transmission mechanism, the outer gear ring II (17) is fixedly connected with the inner wall of a transmission shell (24), and a planetary carrier II (16) is respectively connected with the planetary gear (18) of the transmission mechanism and a transmission output shaft (19); the stators of the first motor (4) and the second motor (3) are respectively arranged in the transmission shell (24).

2. A hybrid vehicle multiple-speed drive system according to claim 1, characterized in that: the multi-gear driving system of the hybrid vehicle further comprises a torsional damper (2) or a dual-mass flywheel; a torsional damper (2) or a dual mass flywheel is connected between the outer hubs of the first clutch (5) and the second clutch (6) and the crankshaft of the engine (1).

3. A hybrid vehicle multiple-speed drive system according to claim 1, characterized in that: the first clutch (5) and the second clutch (6) share one outer hub, or the first clutch (5) and the second clutch (6) respectively have respective outer hubs which are connected in a spline or welding mode.

4. A hybrid vehicle multiple-speed drive system according to any one of claims 1-3, characterized in that: the multi-gear driving system of the hybrid vehicle can realize the following working modes:

a first pure electric mode gear; the two clutches and the two brakes are disconnected, the engine (1) and the motor II (3) do not work, and the motor I (4) works;

a pure electric mode second gear; the second brake (8) and the two clutches are disconnected, the first brake (7) is combined, the engine (1) does not work, and the two motors work;

parallel mode first gear; the second clutch (6) and the second brake (8) are disconnected, the first clutch (5) and the first brake (7) are combined, and the engine (1) and the two motors work;

a parallel mode second gear; the second clutch (6) and the first brake (7) are disconnected, the first clutch (5) and the second brake (8) are combined, the second motor (3) does not work, and the engine (1) and the first motor (4) work;

parallel mode third gear; the two brakes are disconnected, the two clutches are combined, and the engine (1) and the two motors work;

a parallel mode fourth gear; the first clutch (5) and the first brake (7) are disconnected, the second clutch (6) and the second brake (8) are combined, the second motor (3) does not work, and the engine (1) and the first motor (4) work;

a series-parallel mode first gear; the second clutch (6) and the two brakes are disconnected, the first clutch (5) is combined, and the engine (1) and the two motors work;

a series-parallel mode second gear; the first clutch (5) and the two brakes are disconnected, the second clutch (6) is combined, and the engine (1) and the two motors work;

a parking/stopping power generation mode; the first clutch (5) and the two brakes are disconnected, the second clutch (6) is combined, the first motor (4) does not work, and the engine (1) and the second motor (3) work.

5. The hybrid vehicle multi-speed drive system according to claim 4, characterized in that: the power transmission path of the first gear of the pure electric mode is as follows:

the power of the vehicle is provided by the operation of a first motor (4), the first motor (4) is fixedly connected with a first sun gear (15), a second outer gear ring (17) is fixedly connected with the inner wall of a transmission shell (24), and the first sun gear (15) is meshed with a planet gear (18) of a transmission mechanism to carry out power transmission; the power of the motor I (4) is transmitted to a transmission output shaft (19) through a sun gear I (15), a transmission mechanism planet gear (18) and a planet carrier II (16) in sequence to be output;

the brake I (7) is combined, the power of the vehicle is provided by the joint work of the motor I (4) and the motor II (3), the brake I (7) is connected with the planet carrier I (11), the motor II (3) operates to provide reverse rotating speed and torque, the provided power is transmitted to the long planet gear (14) through the sun gear II (9), and the long planet gear (14) transmits the power to the transmission output shaft (19) through the outer gear ring I (12) and the planet carrier II (16) in sequence;

the first motor (4) is fixedly connected with the first sun gear (15), the second outer gear ring (17) is fixedly connected with the transmission shell (24), and the first sun gear (15) is meshed with the planet gear (18) of the transmission mechanism to carry out power transmission; the power of the first motor (4) is transmitted to a transmission output shaft (19) through a first sun gear (15), a transmission mechanism planet gear (18) and a second planet carrier (16) in sequence; the power of the first external gear ring (12) and the second planet carrier (16) is transmitted in parallel at the output shaft (19) of the speed changer.

6. The hybrid vehicle multi-speed drive system according to claim 4, characterized in that: the power transmission path of the parallel mode first gear is as follows:

the clutch I (5) and the brake I (7) are combined, and the power of the engine (1) is transmitted to the long planet wheel (14) through the clutch I (5), the sun wheel III (10) and the short planet wheel (13) in sequence; the power of the second motor (3) is transmitted to the long planet wheel (14) through the second sun wheel (9); the power of the engine (1) and the power of the motor II (3) are connected in parallel at the long planet wheel (14) and then transmitted to the outer gear ring I (12), and the outer gear ring I (12) transmits the power to the transmission output shaft (19) through the planet carrier II (16);

the power of the first motor (4) is transmitted to a transmission output shaft (19) through a first sun gear (15), a transmission mechanism planet gear (18) and a second planet carrier (16) in sequence; the power of the first external gear ring (12) and the second planet carrier (16) is connected in parallel at the output shaft (19) of the speed changer for power transmission;

the power transmission path of the parallel mode second gear is as follows:

the clutch I (5) and the brake II (8) are combined, and the rotor of the motor II (3) and the sun gear II (9) are locked; the power of the engine (1) is transmitted to the first outer gear ring (12) through the first clutch (5), the third sun gear (10), the short planet gear (13) and the long planet gear (14) in sequence, and the first outer gear ring (12) transmits the power to the output shaft (19) of the transmission through the second planet carrier (16);

the power transmission path of the parallel mode third gear is as follows:

the first clutch (5) and the second clutch (6) are combined, and the power of the engine (1) is transmitted to the first clutch (5) and the second clutch (6); the clutch I (5) transmits power to the long planet wheel (14) through the sun wheel III (10) and the short planet wheel (13) in sequence; the second clutch (6) transmits power to the long planet wheel (14) through the first planet carrier (11); the power of the second motor (3) is transmitted to the long planet wheel (14) through the second sun wheel (9); the power of the clutch I (5), the clutch II (6) and the motor II (3) is connected in parallel at the position of the long planet wheel (14) and then transmitted to the outer gear ring I (12), and the outer gear ring I (12) transmits the power to the output shaft (19) of the transmission through the planet carrier II (16);

the power transmission path of the parallel mode fourth gear is as follows:

the clutch II (6) and the brake II (8) are combined, and the rotor of the motor II (3) and the sun gear II (9) are locked; the power of the engine (1) is transmitted to the first outer gear ring (12) through the second clutch (6), the first planet carrier (11) and the long planet wheel (14) in sequence, and the first outer gear ring (12) transmits the power to the output shaft (19) of the transmission through the second planet carrier (16);

the power of the first motor (4) is transmitted to a transmission output shaft (19) through a first sun gear (15), a transmission mechanism planet gear (18) and a second planet carrier (16) in sequence; the power of the first external gear ring (12) and the second planet carrier (16) is transmitted in parallel at the output shaft (19) of the speed changer.

7. The hybrid vehicle multi-speed drive system according to claim 4, characterized in that: the power transmission path of the first gear of the series-parallel mode is as follows;

the first clutch (5) is combined, and the engine (1) and the two motors work; regarding the rotational speed: the rotating speeds of the engine (1) and the motor II (3) are controlled, the power of the engine (1) is transmitted to the long planet wheel (14) through the clutch I (5), the sun wheel III (10) and the short planet wheel (13) in sequence, and the power of the motor II (3) is transmitted to the long planet wheel (14) through the sun wheel II (9); the power of the engine (1) and the power of the motor II (3) are connected in parallel at the long planetary gear (14) and then are transmitted to the outer gear ring I (12), so that the rotating speed of the outer gear ring I (12) can be known; the outer gear ring I (12) transmits power to the planet carrier II (16), the transmission mechanism planet gear (18) and the sun gear I (15) in sequence, the sun gear I (15) transmits the power to the motor I (4), and the rotating speed of the motor I (4) can be known;

or the rotating speeds of the engine (1) and the motor I (4) are controlled, and the power of the motor I (4) is transmitted to the long planet wheel (14) through the sun wheel I (15), the transmission mechanism planet wheel (18), the planet carrier II (16) and the outer gear ring I (12) in sequence; the power of the engine (1) is transmitted to the long planet wheel (14) through the clutch I (5), the sun wheel III (10) and the short planet wheel (13) in sequence; the power of the engine (1) and the power of the motor I (4) are connected in parallel at the long planet wheel (14) and then are transmitted to the motor II (3) through the sun wheel II (9), so that the rotating speed of the motor II (3) can be known;

with respect to the torque: the torque of the engine (1) is transmitted to the long planet wheel (14) through the clutch I (5), the sun wheel III (10) and the short planet wheel (13) in sequence; one part of the torque is transmitted to a second sun wheel (9) and a second motor (3) through a long planet wheel (14); the other part of the torque is transmitted to the first external gear ring (12) through the long planetary wheel (14); the first external gear ring (12) transmits the torque to a transmission output shaft (19) through a second planet carrier (16); the torque of the first motor (4) is transmitted to a transmission output shaft (19) through a first sun gear (15), a transmission mechanism planet gear (18) and a second planet carrier (16) in sequence; the torques of the first external gear ring (12) and the second planet carrier (16) are connected in parallel at the output shaft (19) of the speed changer for power transmission;

the clutch II (6) is combined, and the engine (1) and the two motors work; regarding the rotational speed: the rotating speeds of the engine (1) and the motor II (3) are controlled, and the power of the engine (1) is transmitted to the long planet wheel (14) through the clutch II (6) and the planet carrier I (11) in sequence; the power of the second motor (3) is transmitted to the long planet wheel (14) through the second sun wheel (9); the power of the engine (1) and the power of the motor II (3) are connected in parallel at the long planet wheel (14) and then transmitted to the outer gear ring I (12), so that the rotating speed of the outer gear ring I (12) can be known; the outer gear ring I (12) transmits power to the planet carrier II (16), the transmission mechanism planet gear (18) and the sun gear I (15) in sequence, the sun gear I (15) transmits the power to the motor I (4), and the rotating speed of the motor I (4) can be known;

or the rotating speeds of the engine (1) and the motor I (4) are controlled, and the power of the engine (1) is transmitted to the long planet wheel (14) through the clutch II (6) and the planet carrier I (11) in sequence; the power of the motor I (4) is transmitted to the long planet wheel (14) through the sun wheel I (15), the planet wheel (18) of the transmission mechanism, the planet carrier II (16) and the outer gear ring I (12) in sequence; the power of the engine (1) and the power of the motor I (4) are connected in parallel at the long planet wheel (14) and then are transmitted to the motor II (3) through the sun wheel II (9), so that the rotating speed of the motor II (3) can be known;

with respect to the torque: the torque of the engine (1) is transmitted to the long planet wheel (14) through the clutch II (6) and the planet carrier I (11) in sequence, and a part of the torque is transmitted to the sun wheel II (9) and the motor II (3) through the long planet wheel (14); the other part of the torque is transmitted to the first external gear ring (12) through the long planetary wheel (14); the first external gear ring (12) transmits the torque to a transmission output shaft (19) through a second planet carrier (16);

the torque of the first motor (4) is transmitted to a transmission output shaft (19) through a first sun gear (15), a transmission mechanism planet gear (18) and a second planet carrier (16) in sequence; the torques of the first external gear (12) and the second planet carrier (16) are connected in parallel at a transmission output shaft (19) for power transmission.

8. The hybrid vehicle multi-speed drive system according to claim 4, characterized in that: the power transmission path in the parking/stop power generation mode is as follows;

when the vehicle is parked/stopped, the engine (1) is started through the second motor (3), after the engine (1) is started successfully, power of the engine (1) is transmitted to the long planet wheel (14) and the short planet wheel (13) through the second clutch (6) and the first planet carrier (11), the long planet wheel (14) transmits the power to the second sun wheel (9), and the second sun wheel (9) is connected with a rotor shaft of the second motor (3), so that the power is transmitted to the second motor (3) through the second sun wheel (9) to rotate and generate power, and mechanical energy is converted into electric energy.